Anderson, R. Y., Dean, W. E., Kirkland, D. W., and Snyder, H. I., 1972, Permian Castile varved evaporite sequence, West Texas and New Mexico: Geological Society of America Bulletin, v. 83, p. 59-86.
Cuffey, R. J., 1967, Bryozoan Tabulipora carbonaria in Wreford Megacyclothem (Lower Permian) of Kansas: University of Kansas Paleontological Contributions, p. 1-96.
Ross, C. A., and Ross, J. P., 1962, Pennsylvanian, Permian rugose corals, Glass Mountains, Texas: Journal of Paleontology, v. 36, p. 1163-1188.
Wilde, G. L., 1971, Phylogeny of Pseudofusulinella and its bearing on Early Permian stratigraphy: Smithsonian Contributions to Paleobiology, v. 3, p. 363-379.
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